Professor of Silviculture at the Faculty of Environment and Natural Resources at Freiburg University, Germany, since 2003.
From 1996 to 2003 he worked at the Australian National University. His research on dynamics and management of structure and composition of forests, carbon and nutrient cycles, ecological interactions in mixed-species forests, as well as the adaptation of forests to global change. He published several books and more than 150 peer-reviewed papers and book chapters. He is a member of the Scientific Advisory Board on Forest Policy at the German Federal Ministry of Food and Agriculture. For his scientific accomplishments he received in 2014 the IUFRO scientific achievement award.